ANSWERS: 1
  • To qualify as high definition, a television or monitor must be capable of portraying an image in an aspect ratio of 16-to-1---that is, the length of the display divided by the height must equal about 1.77 (16 divided by 9). It also must have a vertical resolution of at least 720 pixels.

    Source:

    Webopedia: What is HDTV?

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